0x01 前言概述 好消息好消息-作者又在MySQL中发现了一个Double型数据溢出.如果你想了解利用溢出来注出数据,你可以读一下作者之前发的博文:BIGINT Overflow Error based injections,drops上面也有对应翻译,具体见这里.当我们拿到MySQL里的函数时,作者比较感兴趣的是其中的数学函数,它们也应该包含一些数据类型来保存数值.所以作者就跑去测试看哪些函数会出现溢出错误.然后作者发现,当传递一个大于709的值时,函数exp()就会引起一个溢出错误. my
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例:假设一个账户密码的输入在数据库中是这样进行判断的. ' ) AS PWDCORRECT FROM T_USER WHERE FUSER= 'GUEST' 如果输入: ') AS PWDCORRECT FROM T_USER WHERE FUSER='ABC' 因为 ‘1’=‘1’ 永远返回的是true 所以 这就造成了SQL 的注入漏洞. 解决办法: ①:过滤敏感字符 if(user.contains("or","and","select",
<select id="findUsersByUserName2" resultType="java.util.Map" parameterType="Params"> SELECT id as uid, username as uname, password as pwd, account as act, telephone, idcard, create_time as createTime, is_delete as isDel